Overview
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ABSTRACT
This article starts by studying the characteristics of products that allow for the determination of the best transportation phase capable of meeting the requirements of the process. The theoretical description of the gas/solid diphasic flow leading to the calculation of the gas flow, and the evaluation of related pressure losses are then dealt with. This article proceeds by presenting the parameters for the choice of the selection mode (suction, blowing, closed loop), of the technology of devices for the introduction of the product into the circuit, of pipes and their diverter valves and gas/solid separation systems. It concludes with an application presentation, together with advice on its operation, maintenance and security.
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Read the articleAUTHOR
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Thierry destoop: Engineer from the Lille University Engineering School (EUDIL) - Doctorate in mechanical engineering - Technical Manager at NEU International Process - This article is an updated version of the eponymous article by the same author published in 1999.
INTRODUCTION
Bulk processes generally include :
drying ;
granulation ;
grinding ;
sieving ;
dosage ;
mix ;
homogenization ;
storage ;
bagging...
These operations are interconnected by pneumatic handling systems. These systems involve conveying operations using equipment based on the principle of driving a solid bulk product through a gaseous stream in a sealed pipe.
The development of this technology has followed the tremendous evolution of inorganic chemistry, organic chemistry, food processing and pharmaceuticals.
In the field of inorganic chemistry, all products in powder or granular form are nowadays transported using this technique:
cement ;
sand ;
ores and minerals ;
ash from combustion ;
uranium ores ;
titanium dioxide ;
constituents of detergent products...
In organic chemistry, we mainly find plastics in powder or granulated form (PP, PE, PVC, PS, PET, PC, PA...), but also biomass in many forms.
In the food industry, the most striking development has been the move towards fast food. To supply the various machines used to manufacture these products, we had to imagine all the logistics and flow management operations. These included the following positions:
transport of raw materials from production sites to processing and storage sites;
distribution, dosing and mixing of these different materials to produce finished products;
packaging and delivery to distribution outlets.
In the pharmaceutical sector, hygiene and safety regulations, as well as increased production capacity, have made this technology the preferred choice in many cases.
Who could have imagined, back in 1900, that plastic pellets, breakfast cereals, strawberries, ice flakes, chocolate-coated peanuts, or even medicine tablets could be transported pneumatically at material flow rates of over 50 t/h, over distances of up to several hundred meters?
Today, it is customary to distinguish between three main pneumatic handling families:
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KEYWORDS
fluid | gas-solid flow | foundry | petrochemistry | food industries
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Logistics and Supply Chain
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Pneumatic handling of bulk materials
Bibliography
Websites
Magazines
• BULK SOLIDS HANDLING http://www.bulk-solids-handling.com
• CHEMISTRY INFO http://www.industrie.com/chimie
Events
In general, see the following general list: http://www.foiresinfo.fr
• CFIA Rennes http://www.cfiaexpo.com
• CFIA Lyon http://www.europack-euromanut-cfia.com
...Standards and norms
- Continuous handling equipment and systems – Safety requirements for systems and components for pneumatic handling of bulk materials - EN741 – A1 - 2000-2010
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